Non-cyanide alkaline silver plating method

Abstract

The invention provides an environmentally-friendly non-cyanide alkaline silver plating electroplating liquid having a dispersive capacity reaching up to 84.12 percent, which is considerably higher than a dispersive capacity being 59.4 percent to 72.7 percent in the same domestic industry, and is approximate to a dispersive capacity being 86.04 percent in the foreign advanced technology; a platingliquid performance is greatly improved compared with a domestic company, and the surface gloss and the stability of a plating layer are remarkably improved; compared with the foreign advanced technology, the invention still has a margin but undoubtedly has a great pioneering significance and enthusiasm on improving a domestic non-cyanide alkaline silver plating technology and breaking a foreign high-technology monopoly, and has a wide market prospect; a full silver plating layer with a bright mirror surface can be obtained, a current density range is wide, a surface is smooth, an anti-tarnishproperty is good, the corrosion resistance and the wear resistance are high, a binding force of the plating layer is good, a dispersive capacity and a covering capacity are excellent, electroplating wastewater is treated easily, the maintenance is simple, and the economy and the practicability are realized.

Description

technical field [0001] The invention relates to a silver plating process, in particular to a cyanide-free alkaline silver plating method. Background technique [0002] For a long time in the past, because of the good stability of the cyanide plating solution, strong throwing ability, fine coating, and good corrosion resistance, the cyanide silver plating process has been widely used. However, due to the severe hydrogen evolution during the cyanide silver plating process, the silver plating layer is highly brittle, and the cyanide silver plating solution is highly toxic, making it difficult to treat wastewater and seriously pollute the atmosphere and groundwater. Silver plating and weak acid silver plating processes are gradually developed and used in industrial electroplating to replace cyanide silver plating. Corresponding to the cyanide silver plating process, the destructive power of the alkaline silver plating process to the environment is greatly reduced, but the curre...

AI Technical Summary

Problems solved by technology

These intermediates individually or in combination have a certain brightness-enhancing effect, but they are not perfect for the coating. Only the main light agent is added to the base liquid. Although the brightness of the coating can be greatly displayed, it cannot fully Dissolve into the bulk plating solution and evenly absorb and wet the metal / solution interface, resulting in inevitable airflow and scars on the metal surface, especially in the high current area, and even foggy and missing plating in the low current area

The crystal grains are large, the thickness of the coating is extremely uneven, and the brittleness is relatively large